SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1230, 1227, 77, 1235, 1958, 1712, 1759, 
    1002, 1381, 1320, 359, 1892, 1176, 1201, 
    1191, 1182, 1825, 1824, 1821, 1761, 
    1823, 1822, 1193, 701, 699, 711, 703, 
    710, 706, 1760, 1844, 1689, 1754, 1755, 
    1840, 1756, 1753, 1472, 1145, 1202, 
    247, 296, 1765, 820, 1816, 1766, 1219, 
    1220
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00190

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 48,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1230,1227,77,1235,1958,1712,1759,1002,1381,1320,359,1892,1176,1201,1191,1182,1825,1824,1821,1761,1823,1822,1193,701,699,711,703,710,706,1760,1844,1689,1754,1755,1840,1756,1753,1472,1145,1202,247,296,1765,820,1816,1766,1219,1220) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
77
247
296
359
699
701
703
706
710
711
820
1002
1145
1176
1182
1191
1193
1201
1202
1219
1220
1227
1230
1235
1320
1381
1472
1689
1712
1753
1754
1755
1756
1759
1760
1761
1765
1766
1816
1821
1822
1823
1824
1825
1840
1844
1892
1958